Baseline data will be collected within the first 24 hours of patients' visit to the hospital. The researcher will collect some clinical information, socio-demographic, anthropometric, breathlessness and peripheral oxygen saturation of all participants. A multi-channel system with 7 microphones (attached to the patients' chest) will be connected to a laptop and will be used to record the lung sounds data. Patients will then lie down in supine on the machine plinth and a HRCT scan of the chest will be acquired. Lung function and exercise tolerance data will then be recorded.